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1da177e4 LT |
1 | /* |
2 | * CMOS/NV-RAM driver for Linux | |
3 | * | |
4 | * Copyright (C) 1997 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> | |
5 | * idea by and with help from Richard Jelinek <rj@suse.de> | |
6 | * Portions copyright (c) 2001,2002 Sun Microsystems (thockin@sun.com) | |
7 | * | |
8 | * This driver allows you to access the contents of the non-volatile memory in | |
9 | * the mc146818rtc.h real-time clock. This chip is built into all PCs and into | |
10 | * many Atari machines. In the former it's called "CMOS-RAM", in the latter | |
11 | * "NVRAM" (NV stands for non-volatile). | |
12 | * | |
13 | * The data are supplied as a (seekable) character device, /dev/nvram. The | |
14 | * size of this file is dependent on the controller. The usual size is 114, | |
15 | * the number of freely available bytes in the memory (i.e., not used by the | |
16 | * RTC itself). | |
17 | * | |
18 | * Checksums over the NVRAM contents are managed by this driver. In case of a | |
19 | * bad checksum, reads and writes return -EIO. The checksum can be initialized | |
20 | * to a sane state either by ioctl(NVRAM_INIT) (clear whole NVRAM) or | |
21 | * ioctl(NVRAM_SETCKS) (doesn't change contents, just makes checksum valid | |
22 | * again; use with care!) | |
23 | * | |
24 | * This file also provides some functions for other parts of the kernel that | |
25 | * want to access the NVRAM: nvram_{read,write,check_checksum,set_checksum}. | |
26 | * Obviously this can be used only if this driver is always configured into | |
27 | * the kernel and is not a module. Since the functions are used by some Atari | |
28 | * drivers, this is the case on the Atari. | |
29 | * | |
30 | * | |
31 | * 1.1 Cesar Barros: SMP locking fixes | |
32 | * added changelog | |
33 | * 1.2 Erik Gilling: Cobalt Networks support | |
34 | * Tim Hockin: general cleanup, Cobalt support | |
35 | */ | |
36 | ||
37 | #define NVRAM_VERSION "1.2" | |
38 | ||
39 | #include <linux/module.h> | |
40 | #include <linux/config.h> | |
41 | #include <linux/sched.h> | |
42 | #include <linux/smp_lock.h> | |
43 | #include <linux/nvram.h> | |
44 | ||
45 | #define PC 1 | |
46 | #define ATARI 2 | |
47 | #define COBALT 3 | |
48 | ||
49 | /* select machine configuration */ | |
50 | #if defined(CONFIG_ATARI) | |
51 | # define MACH ATARI | |
52 | #elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and others?? */ | |
53 | #define MACH PC | |
54 | # if defined(CONFIG_COBALT) | |
55 | # include <linux/cobalt-nvram.h> | |
56 | # define MACH COBALT | |
57 | # else | |
58 | # define MACH PC | |
59 | # endif | |
60 | #else | |
61 | # error Cannot build nvram driver for this machine configuration. | |
62 | #endif | |
63 | ||
64 | #if MACH == PC | |
65 | ||
66 | /* RTC in a PC */ | |
67 | #define CHECK_DRIVER_INIT() 1 | |
68 | ||
69 | /* On PCs, the checksum is built only over bytes 2..31 */ | |
70 | #define PC_CKS_RANGE_START 2 | |
71 | #define PC_CKS_RANGE_END 31 | |
72 | #define PC_CKS_LOC 32 | |
73 | #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE) | |
74 | ||
75 | #define mach_check_checksum pc_check_checksum | |
76 | #define mach_set_checksum pc_set_checksum | |
77 | #define mach_proc_infos pc_proc_infos | |
78 | ||
79 | #endif | |
80 | ||
81 | #if MACH == COBALT | |
82 | ||
83 | #define CHECK_DRIVER_INIT() 1 | |
84 | ||
85 | #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE) | |
86 | ||
87 | #define mach_check_checksum cobalt_check_checksum | |
88 | #define mach_set_checksum cobalt_set_checksum | |
89 | #define mach_proc_infos cobalt_proc_infos | |
90 | ||
91 | #endif | |
92 | ||
93 | #if MACH == ATARI | |
94 | ||
95 | /* Special parameters for RTC in Atari machines */ | |
96 | #include <asm/atarihw.h> | |
97 | #include <asm/atariints.h> | |
98 | #define RTC_PORT(x) (TT_RTC_BAS + 2*(x)) | |
99 | #define CHECK_DRIVER_INIT() (MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK)) | |
100 | ||
101 | #define NVRAM_BYTES 50 | |
102 | ||
103 | /* On Ataris, the checksum is over all bytes except the checksum bytes | |
104 | * themselves; these are at the very end */ | |
105 | #define ATARI_CKS_RANGE_START 0 | |
106 | #define ATARI_CKS_RANGE_END 47 | |
107 | #define ATARI_CKS_LOC 48 | |
108 | ||
109 | #define mach_check_checksum atari_check_checksum | |
110 | #define mach_set_checksum atari_set_checksum | |
111 | #define mach_proc_infos atari_proc_infos | |
112 | ||
113 | #endif | |
114 | ||
115 | /* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with | |
116 | * rtc_lock held. Due to the index-port/data-port design of the RTC, we | |
117 | * don't want two different things trying to get to it at once. (e.g. the | |
118 | * periodic 11 min sync from time.c vs. this driver.) | |
119 | */ | |
120 | ||
121 | #include <linux/types.h> | |
122 | #include <linux/errno.h> | |
123 | #include <linux/miscdevice.h> | |
124 | #include <linux/slab.h> | |
125 | #include <linux/ioport.h> | |
126 | #include <linux/fcntl.h> | |
127 | #include <linux/mc146818rtc.h> | |
128 | #include <linux/init.h> | |
129 | #include <linux/proc_fs.h> | |
130 | #include <linux/spinlock.h> | |
131 | ||
132 | #include <asm/io.h> | |
133 | #include <asm/uaccess.h> | |
134 | #include <asm/system.h> | |
135 | ||
136 | static DEFINE_SPINLOCK(nvram_state_lock); | |
137 | static int nvram_open_cnt; /* #times opened */ | |
138 | static int nvram_open_mode; /* special open modes */ | |
139 | #define NVRAM_WRITE 1 /* opened for writing (exclusive) */ | |
140 | #define NVRAM_EXCL 2 /* opened with O_EXCL */ | |
141 | ||
142 | static int mach_check_checksum(void); | |
143 | static void mach_set_checksum(void); | |
144 | ||
145 | #ifdef CONFIG_PROC_FS | |
146 | static int mach_proc_infos(unsigned char *contents, char *buffer, int *len, | |
147 | off_t *begin, off_t offset, int size); | |
148 | #endif | |
149 | ||
150 | /* | |
151 | * These functions are provided to be called internally or by other parts of | |
152 | * the kernel. It's up to the caller to ensure correct checksum before reading | |
153 | * or after writing (needs to be done only once). | |
154 | * | |
155 | * It is worth noting that these functions all access bytes of general | |
156 | * purpose memory in the NVRAM - that is to say, they all add the | |
157 | * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not | |
158 | * know about the RTC cruft. | |
159 | */ | |
160 | ||
161 | unsigned char | |
162 | __nvram_read_byte(int i) | |
163 | { | |
164 | return CMOS_READ(NVRAM_FIRST_BYTE + i); | |
165 | } | |
166 | ||
167 | unsigned char | |
168 | nvram_read_byte(int i) | |
169 | { | |
170 | unsigned long flags; | |
171 | unsigned char c; | |
172 | ||
173 | spin_lock_irqsave(&rtc_lock, flags); | |
174 | c = __nvram_read_byte(i); | |
175 | spin_unlock_irqrestore(&rtc_lock, flags); | |
176 | return c; | |
177 | } | |
178 | ||
179 | /* This races nicely with trying to read with checksum checking (nvram_read) */ | |
180 | void | |
181 | __nvram_write_byte(unsigned char c, int i) | |
182 | { | |
183 | CMOS_WRITE(c, NVRAM_FIRST_BYTE + i); | |
184 | } | |
185 | ||
186 | void | |
187 | nvram_write_byte(unsigned char c, int i) | |
188 | { | |
189 | unsigned long flags; | |
190 | ||
191 | spin_lock_irqsave(&rtc_lock, flags); | |
192 | __nvram_write_byte(c, i); | |
193 | spin_unlock_irqrestore(&rtc_lock, flags); | |
194 | } | |
195 | ||
196 | int | |
197 | __nvram_check_checksum(void) | |
198 | { | |
199 | return mach_check_checksum(); | |
200 | } | |
201 | ||
202 | int | |
203 | nvram_check_checksum(void) | |
204 | { | |
205 | unsigned long flags; | |
206 | int rv; | |
207 | ||
208 | spin_lock_irqsave(&rtc_lock, flags); | |
209 | rv = __nvram_check_checksum(); | |
210 | spin_unlock_irqrestore(&rtc_lock, flags); | |
211 | return rv; | |
212 | } | |
213 | ||
214 | void | |
215 | __nvram_set_checksum(void) | |
216 | { | |
217 | mach_set_checksum(); | |
218 | } | |
219 | ||
220 | void | |
221 | nvram_set_checksum(void) | |
222 | { | |
223 | unsigned long flags; | |
224 | ||
225 | spin_lock_irqsave(&rtc_lock, flags); | |
226 | __nvram_set_checksum(); | |
227 | spin_unlock_irqrestore(&rtc_lock, flags); | |
228 | } | |
229 | ||
230 | /* | |
231 | * The are the file operation function for user access to /dev/nvram | |
232 | */ | |
233 | ||
234 | static loff_t nvram_llseek(struct file *file,loff_t offset, int origin ) | |
235 | { | |
236 | lock_kernel(); | |
237 | switch (origin) { | |
238 | case 0: | |
239 | /* nothing to do */ | |
240 | break; | |
241 | case 1: | |
242 | offset += file->f_pos; | |
243 | break; | |
244 | case 2: | |
245 | offset += NVRAM_BYTES; | |
246 | break; | |
247 | } | |
248 | unlock_kernel(); | |
249 | return (offset >= 0) ? (file->f_pos = offset) : -EINVAL; | |
250 | } | |
251 | ||
252 | static ssize_t | |
253 | nvram_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
254 | { | |
255 | unsigned char contents[NVRAM_BYTES]; | |
256 | unsigned i = *ppos; | |
257 | unsigned char *tmp; | |
258 | ||
259 | spin_lock_irq(&rtc_lock); | |
260 | ||
261 | if (!__nvram_check_checksum()) | |
262 | goto checksum_err; | |
263 | ||
264 | for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) | |
265 | *tmp = __nvram_read_byte(i); | |
266 | ||
267 | spin_unlock_irq(&rtc_lock); | |
268 | ||
269 | if (copy_to_user(buf, contents, tmp - contents)) | |
270 | return -EFAULT; | |
271 | ||
272 | *ppos = i; | |
273 | ||
274 | return tmp - contents; | |
275 | ||
276 | checksum_err: | |
277 | spin_unlock_irq(&rtc_lock); | |
278 | return -EIO; | |
279 | } | |
280 | ||
281 | static ssize_t | |
282 | nvram_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
283 | { | |
284 | unsigned char contents[NVRAM_BYTES]; | |
285 | unsigned i = *ppos; | |
286 | unsigned char *tmp; | |
287 | int len; | |
288 | ||
289 | len = (NVRAM_BYTES - i) < count ? (NVRAM_BYTES - i) : count; | |
290 | if (copy_from_user(contents, buf, len)) | |
291 | return -EFAULT; | |
292 | ||
293 | spin_lock_irq(&rtc_lock); | |
294 | ||
295 | if (!__nvram_check_checksum()) | |
296 | goto checksum_err; | |
297 | ||
298 | for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) | |
299 | __nvram_write_byte(*tmp, i); | |
300 | ||
301 | __nvram_set_checksum(); | |
302 | ||
303 | spin_unlock_irq(&rtc_lock); | |
304 | ||
305 | *ppos = i; | |
306 | ||
307 | return tmp - contents; | |
308 | ||
309 | checksum_err: | |
310 | spin_unlock_irq(&rtc_lock); | |
311 | return -EIO; | |
312 | } | |
313 | ||
314 | static int | |
315 | nvram_ioctl(struct inode *inode, struct file *file, | |
316 | unsigned int cmd, unsigned long arg) | |
317 | { | |
318 | int i; | |
319 | ||
320 | switch (cmd) { | |
321 | ||
322 | case NVRAM_INIT: | |
323 | /* initialize NVRAM contents and checksum */ | |
324 | if (!capable(CAP_SYS_ADMIN)) | |
325 | return -EACCES; | |
326 | ||
327 | spin_lock_irq(&rtc_lock); | |
328 | ||
329 | for (i = 0; i < NVRAM_BYTES; ++i) | |
330 | __nvram_write_byte(0, i); | |
331 | __nvram_set_checksum(); | |
332 | ||
333 | spin_unlock_irq(&rtc_lock); | |
334 | return 0; | |
335 | ||
336 | case NVRAM_SETCKS: | |
337 | /* just set checksum, contents unchanged (maybe useful after | |
338 | * checksum garbaged somehow...) */ | |
339 | if (!capable(CAP_SYS_ADMIN)) | |
340 | return -EACCES; | |
341 | ||
342 | spin_lock_irq(&rtc_lock); | |
343 | __nvram_set_checksum(); | |
344 | spin_unlock_irq(&rtc_lock); | |
345 | return 0; | |
346 | ||
347 | default: | |
348 | return -ENOTTY; | |
349 | } | |
350 | } | |
351 | ||
352 | static int | |
353 | nvram_open(struct inode *inode, struct file *file) | |
354 | { | |
355 | spin_lock(&nvram_state_lock); | |
356 | ||
357 | if ((nvram_open_cnt && (file->f_flags & O_EXCL)) || | |
358 | (nvram_open_mode & NVRAM_EXCL) || | |
359 | ((file->f_mode & 2) && (nvram_open_mode & NVRAM_WRITE))) { | |
360 | spin_unlock(&nvram_state_lock); | |
361 | return -EBUSY; | |
362 | } | |
363 | ||
364 | if (file->f_flags & O_EXCL) | |
365 | nvram_open_mode |= NVRAM_EXCL; | |
366 | if (file->f_mode & 2) | |
367 | nvram_open_mode |= NVRAM_WRITE; | |
368 | nvram_open_cnt++; | |
369 | ||
370 | spin_unlock(&nvram_state_lock); | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | static int | |
376 | nvram_release(struct inode *inode, struct file *file) | |
377 | { | |
378 | spin_lock(&nvram_state_lock); | |
379 | ||
380 | nvram_open_cnt--; | |
381 | ||
382 | /* if only one instance is open, clear the EXCL bit */ | |
383 | if (nvram_open_mode & NVRAM_EXCL) | |
384 | nvram_open_mode &= ~NVRAM_EXCL; | |
385 | if (file->f_mode & 2) | |
386 | nvram_open_mode &= ~NVRAM_WRITE; | |
387 | ||
388 | spin_unlock(&nvram_state_lock); | |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
393 | #ifndef CONFIG_PROC_FS | |
394 | static int | |
395 | nvram_read_proc(char *buffer, char **start, off_t offset, | |
396 | int size, int *eof, void *data) | |
397 | { | |
398 | return 0; | |
399 | } | |
400 | #else | |
401 | ||
402 | static int | |
403 | nvram_read_proc(char *buffer, char **start, off_t offset, | |
404 | int size, int *eof, void *data) | |
405 | { | |
406 | unsigned char contents[NVRAM_BYTES]; | |
407 | int i, len = 0; | |
408 | off_t begin = 0; | |
409 | ||
410 | spin_lock_irq(&rtc_lock); | |
411 | for (i = 0; i < NVRAM_BYTES; ++i) | |
412 | contents[i] = __nvram_read_byte(i); | |
413 | spin_unlock_irq(&rtc_lock); | |
414 | ||
415 | *eof = mach_proc_infos(contents, buffer, &len, &begin, offset, size); | |
416 | ||
417 | if (offset >= begin + len) | |
418 | return 0; | |
419 | *start = buffer + (offset - begin); | |
420 | return (size < begin + len - offset) ? size : begin + len - offset; | |
421 | ||
422 | } | |
423 | ||
424 | /* This macro frees the machine specific function from bounds checking and | |
425 | * this like that... */ | |
426 | #define PRINT_PROC(fmt,args...) \ | |
427 | do { \ | |
428 | *len += sprintf(buffer+*len, fmt, ##args); \ | |
429 | if (*begin + *len > offset + size) \ | |
430 | return 0; \ | |
431 | if (*begin + *len < offset) { \ | |
432 | *begin += *len; \ | |
433 | *len = 0; \ | |
434 | } \ | |
435 | } while(0) | |
436 | ||
437 | #endif /* CONFIG_PROC_FS */ | |
438 | ||
439 | static struct file_operations nvram_fops = { | |
440 | .owner = THIS_MODULE, | |
441 | .llseek = nvram_llseek, | |
442 | .read = nvram_read, | |
443 | .write = nvram_write, | |
444 | .ioctl = nvram_ioctl, | |
445 | .open = nvram_open, | |
446 | .release = nvram_release, | |
447 | }; | |
448 | ||
449 | static struct miscdevice nvram_dev = { | |
450 | NVRAM_MINOR, | |
451 | "nvram", | |
452 | &nvram_fops | |
453 | }; | |
454 | ||
455 | static int __init | |
456 | nvram_init(void) | |
457 | { | |
458 | int ret; | |
459 | ||
460 | /* First test whether the driver should init at all */ | |
461 | if (!CHECK_DRIVER_INIT()) | |
462 | return -ENXIO; | |
463 | ||
464 | ret = misc_register(&nvram_dev); | |
465 | if (ret) { | |
466 | printk(KERN_ERR "nvram: can't misc_register on minor=%d\n", | |
467 | NVRAM_MINOR); | |
468 | goto out; | |
469 | } | |
470 | if (!create_proc_read_entry("driver/nvram", 0, NULL, nvram_read_proc, | |
471 | NULL)) { | |
472 | printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n"); | |
473 | ret = -ENOMEM; | |
474 | goto outmisc; | |
475 | } | |
476 | ret = 0; | |
477 | printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n"); | |
478 | out: | |
479 | return ret; | |
480 | outmisc: | |
481 | misc_deregister(&nvram_dev); | |
482 | goto out; | |
483 | } | |
484 | ||
485 | static void __exit | |
486 | nvram_cleanup_module(void) | |
487 | { | |
488 | remove_proc_entry("driver/nvram", NULL); | |
489 | misc_deregister(&nvram_dev); | |
490 | } | |
491 | ||
492 | module_init(nvram_init); | |
493 | module_exit(nvram_cleanup_module); | |
494 | ||
495 | /* | |
496 | * Machine specific functions | |
497 | */ | |
498 | ||
499 | #if MACH == PC | |
500 | ||
501 | static int | |
502 | pc_check_checksum(void) | |
503 | { | |
504 | int i; | |
505 | unsigned short sum = 0; | |
506 | unsigned short expect; | |
507 | ||
508 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) | |
509 | sum += __nvram_read_byte(i); | |
510 | expect = __nvram_read_byte(PC_CKS_LOC)<<8 | | |
511 | __nvram_read_byte(PC_CKS_LOC+1); | |
512 | return ((sum & 0xffff) == expect); | |
513 | } | |
514 | ||
515 | static void | |
516 | pc_set_checksum(void) | |
517 | { | |
518 | int i; | |
519 | unsigned short sum = 0; | |
520 | ||
521 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) | |
522 | sum += __nvram_read_byte(i); | |
523 | __nvram_write_byte(sum >> 8, PC_CKS_LOC); | |
524 | __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1); | |
525 | } | |
526 | ||
527 | #ifdef CONFIG_PROC_FS | |
528 | ||
529 | static char *floppy_types[] = { | |
530 | "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M", | |
531 | "3.5'' 2.88M", "3.5'' 2.88M" | |
532 | }; | |
533 | ||
534 | static char *gfx_types[] = { | |
535 | "EGA, VGA, ... (with BIOS)", | |
536 | "CGA (40 cols)", | |
537 | "CGA (80 cols)", | |
538 | "monochrome", | |
539 | }; | |
540 | ||
541 | static int | |
542 | pc_proc_infos(unsigned char *nvram, char *buffer, int *len, | |
543 | off_t *begin, off_t offset, int size) | |
544 | { | |
545 | int checksum; | |
546 | int type; | |
547 | ||
548 | spin_lock_irq(&rtc_lock); | |
549 | checksum = __nvram_check_checksum(); | |
550 | spin_unlock_irq(&rtc_lock); | |
551 | ||
552 | PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not "); | |
553 | ||
554 | PRINT_PROC("# floppies : %d\n", | |
555 | (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0); | |
556 | PRINT_PROC("Floppy 0 type : "); | |
557 | type = nvram[2] >> 4; | |
558 | if (type < sizeof (floppy_types) / sizeof (*floppy_types)) | |
559 | PRINT_PROC("%s\n", floppy_types[type]); | |
560 | else | |
561 | PRINT_PROC("%d (unknown)\n", type); | |
562 | PRINT_PROC("Floppy 1 type : "); | |
563 | type = nvram[2] & 0x0f; | |
564 | if (type < sizeof (floppy_types) / sizeof (*floppy_types)) | |
565 | PRINT_PROC("%s\n", floppy_types[type]); | |
566 | else | |
567 | PRINT_PROC("%d (unknown)\n", type); | |
568 | ||
569 | PRINT_PROC("HD 0 type : "); | |
570 | type = nvram[4] >> 4; | |
571 | if (type) | |
572 | PRINT_PROC("%02x\n", type == 0x0f ? nvram[11] : type); | |
573 | else | |
574 | PRINT_PROC("none\n"); | |
575 | ||
576 | PRINT_PROC("HD 1 type : "); | |
577 | type = nvram[4] & 0x0f; | |
578 | if (type) | |
579 | PRINT_PROC("%02x\n", type == 0x0f ? nvram[12] : type); | |
580 | else | |
581 | PRINT_PROC("none\n"); | |
582 | ||
583 | PRINT_PROC("HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", | |
584 | nvram[18] | (nvram[19] << 8), | |
585 | nvram[20], nvram[25], | |
586 | nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8)); | |
587 | PRINT_PROC("HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", | |
588 | nvram[39] | (nvram[40] << 8), | |
589 | nvram[41], nvram[46], | |
590 | nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8)); | |
591 | ||
592 | PRINT_PROC("DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8)); | |
593 | PRINT_PROC("Extended memory: %d kB (configured), %d kB (tested)\n", | |
594 | nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8)); | |
595 | ||
596 | PRINT_PROC("Gfx adapter : %s\n", gfx_types[(nvram[6] >> 4) & 3]); | |
597 | ||
598 | PRINT_PROC("FPU : %sinstalled\n", | |
599 | (nvram[6] & 2) ? "" : "not "); | |
600 | ||
601 | return 1; | |
602 | } | |
603 | #endif | |
604 | ||
605 | #endif /* MACH == PC */ | |
606 | ||
607 | #if MACH == COBALT | |
608 | ||
609 | /* the cobalt CMOS has a wider range of its checksum */ | |
610 | static int cobalt_check_checksum(void) | |
611 | { | |
612 | int i; | |
613 | unsigned short sum = 0; | |
614 | unsigned short expect; | |
615 | ||
616 | for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) { | |
617 | if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1))) | |
618 | continue; | |
619 | ||
620 | sum += __nvram_read_byte(i); | |
621 | } | |
622 | expect = __nvram_read_byte(COBT_CMOS_CHECKSUM) << 8 | | |
623 | __nvram_read_byte(COBT_CMOS_CHECKSUM+1); | |
624 | return ((sum & 0xffff) == expect); | |
625 | } | |
626 | ||
627 | static void cobalt_set_checksum(void) | |
628 | { | |
629 | int i; | |
630 | unsigned short sum = 0; | |
631 | ||
632 | for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) { | |
633 | if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1))) | |
634 | continue; | |
635 | ||
636 | sum += __nvram_read_byte(i); | |
637 | } | |
638 | ||
639 | __nvram_write_byte(sum >> 8, COBT_CMOS_CHECKSUM); | |
640 | __nvram_write_byte(sum & 0xff, COBT_CMOS_CHECKSUM+1); | |
641 | } | |
642 | ||
643 | #ifdef CONFIG_PROC_FS | |
644 | ||
645 | static int cobalt_proc_infos(unsigned char *nvram, char *buffer, int *len, | |
646 | off_t *begin, off_t offset, int size) | |
647 | { | |
648 | int i; | |
649 | unsigned int checksum; | |
650 | unsigned int flags; | |
651 | char sernum[14]; | |
652 | char *key = "cNoEbTaWlOtR!"; | |
653 | unsigned char bto_csum; | |
654 | ||
655 | spin_lock_irq(&rtc_lock); | |
656 | checksum = __nvram_check_checksum(); | |
657 | spin_unlock_irq(&rtc_lock); | |
658 | ||
659 | PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not "); | |
660 | ||
661 | flags = nvram[COBT_CMOS_FLAG_BYTE_0] << 8 | |
662 | | nvram[COBT_CMOS_FLAG_BYTE_1]; | |
663 | ||
664 | PRINT_PROC("Console: %s\n", | |
665 | flags & COBT_CMOS_CONSOLE_FLAG ? "on": "off"); | |
666 | ||
667 | PRINT_PROC("Firmware Debug Messages: %s\n", | |
668 | flags & COBT_CMOS_DEBUG_FLAG ? "on": "off"); | |
669 | ||
670 | PRINT_PROC("Auto Prompt: %s\n", | |
671 | flags & COBT_CMOS_AUTO_PROMPT_FLAG ? "on": "off"); | |
672 | ||
673 | PRINT_PROC("Shutdown Status: %s\n", | |
674 | flags & COBT_CMOS_CLEAN_BOOT_FLAG ? "clean": "dirty"); | |
675 | ||
676 | PRINT_PROC("Hardware Probe: %s\n", | |
677 | flags & COBT_CMOS_HW_NOPROBE_FLAG ? "partial": "full"); | |
678 | ||
679 | PRINT_PROC("System Fault: %sdetected\n", | |
680 | flags & COBT_CMOS_SYSFAULT_FLAG ? "": "not "); | |
681 | ||
682 | PRINT_PROC("Panic on OOPS: %s\n", | |
683 | flags & COBT_CMOS_OOPSPANIC_FLAG ? "yes": "no"); | |
684 | ||
685 | PRINT_PROC("Delayed Cache Initialization: %s\n", | |
686 | flags & COBT_CMOS_DELAY_CACHE_FLAG ? "yes": "no"); | |
687 | ||
688 | PRINT_PROC("Show Logo at Boot: %s\n", | |
689 | flags & COBT_CMOS_NOLOGO_FLAG ? "no": "yes"); | |
690 | ||
691 | PRINT_PROC("Boot Method: "); | |
692 | switch (nvram[COBT_CMOS_BOOT_METHOD]) { | |
693 | case COBT_CMOS_BOOT_METHOD_DISK: | |
694 | PRINT_PROC("disk\n"); | |
695 | break; | |
696 | ||
697 | case COBT_CMOS_BOOT_METHOD_ROM: | |
698 | PRINT_PROC("rom\n"); | |
699 | break; | |
700 | ||
701 | case COBT_CMOS_BOOT_METHOD_NET: | |
702 | PRINT_PROC("net\n"); | |
703 | break; | |
704 | ||
705 | default: | |
706 | PRINT_PROC("unknown\n"); | |
707 | break; | |
708 | } | |
709 | ||
710 | PRINT_PROC("Primary Boot Device: %d:%d\n", | |
711 | nvram[COBT_CMOS_BOOT_DEV0_MAJ], | |
712 | nvram[COBT_CMOS_BOOT_DEV0_MIN] ); | |
713 | PRINT_PROC("Secondary Boot Device: %d:%d\n", | |
714 | nvram[COBT_CMOS_BOOT_DEV1_MAJ], | |
715 | nvram[COBT_CMOS_BOOT_DEV1_MIN] ); | |
716 | PRINT_PROC("Tertiary Boot Device: %d:%d\n", | |
717 | nvram[COBT_CMOS_BOOT_DEV2_MAJ], | |
718 | nvram[COBT_CMOS_BOOT_DEV2_MIN] ); | |
719 | ||
720 | PRINT_PROC("Uptime: %d\n", | |
721 | nvram[COBT_CMOS_UPTIME_0] << 24 | | |
722 | nvram[COBT_CMOS_UPTIME_1] << 16 | | |
723 | nvram[COBT_CMOS_UPTIME_2] << 8 | | |
724 | nvram[COBT_CMOS_UPTIME_3]); | |
725 | ||
726 | PRINT_PROC("Boot Count: %d\n", | |
727 | nvram[COBT_CMOS_BOOTCOUNT_0] << 24 | | |
728 | nvram[COBT_CMOS_BOOTCOUNT_1] << 16 | | |
729 | nvram[COBT_CMOS_BOOTCOUNT_2] << 8 | | |
730 | nvram[COBT_CMOS_BOOTCOUNT_3]); | |
731 | ||
732 | /* 13 bytes of serial num */ | |
733 | for (i=0 ; i<13 ; i++) { | |
734 | sernum[i] = nvram[COBT_CMOS_SYS_SERNUM_0 + i]; | |
735 | } | |
736 | sernum[13] = '\0'; | |
737 | ||
738 | checksum = 0; | |
739 | for (i=0 ; i<13 ; i++) { | |
740 | checksum += sernum[i] ^ key[i]; | |
741 | } | |
742 | checksum = ((checksum & 0x7f) ^ (0xd6)) & 0xff; | |
743 | ||
744 | PRINT_PROC("Serial Number: %s", sernum); | |
745 | if (checksum != nvram[COBT_CMOS_SYS_SERNUM_CSUM]) { | |
746 | PRINT_PROC(" (invalid checksum)"); | |
747 | } | |
748 | PRINT_PROC("\n"); | |
749 | ||
750 | PRINT_PROC("Rom Revison: %d.%d.%d\n", nvram[COBT_CMOS_ROM_REV_MAJ], | |
751 | nvram[COBT_CMOS_ROM_REV_MIN], nvram[COBT_CMOS_ROM_REV_REV]); | |
752 | ||
753 | PRINT_PROC("BTO Server: %d.%d.%d.%d", nvram[COBT_CMOS_BTO_IP_0], | |
754 | nvram[COBT_CMOS_BTO_IP_1], nvram[COBT_CMOS_BTO_IP_2], | |
755 | nvram[COBT_CMOS_BTO_IP_3]); | |
756 | bto_csum = nvram[COBT_CMOS_BTO_IP_0] + nvram[COBT_CMOS_BTO_IP_1] | |
757 | + nvram[COBT_CMOS_BTO_IP_2] + nvram[COBT_CMOS_BTO_IP_3]; | |
758 | if (bto_csum != nvram[COBT_CMOS_BTO_IP_CSUM]) { | |
759 | PRINT_PROC(" (invalid checksum)"); | |
760 | } | |
761 | PRINT_PROC("\n"); | |
762 | ||
763 | if (flags & COBT_CMOS_VERSION_FLAG | |
764 | && nvram[COBT_CMOS_VERSION] >= COBT_CMOS_VER_BTOCODE) { | |
765 | PRINT_PROC("BTO Code: 0x%x\n", | |
766 | nvram[COBT_CMOS_BTO_CODE_0] << 24 | | |
767 | nvram[COBT_CMOS_BTO_CODE_1] << 16 | | |
768 | nvram[COBT_CMOS_BTO_CODE_2] << 8 | | |
769 | nvram[COBT_CMOS_BTO_CODE_3]); | |
770 | } | |
771 | ||
772 | return 1; | |
773 | } | |
774 | #endif /* CONFIG_PROC_FS */ | |
775 | ||
776 | #endif /* MACH == COBALT */ | |
777 | ||
778 | #if MACH == ATARI | |
779 | ||
780 | static int | |
781 | atari_check_checksum(void) | |
782 | { | |
783 | int i; | |
784 | unsigned char sum = 0; | |
785 | ||
786 | for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) | |
787 | sum += __nvram_read_byte(i); | |
788 | return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff) && | |
789 | __nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff)); | |
790 | } | |
791 | ||
792 | static void | |
793 | atari_set_checksum(void) | |
794 | { | |
795 | int i; | |
796 | unsigned char sum = 0; | |
797 | ||
798 | for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) | |
799 | sum += __nvram_read_byte(i); | |
800 | __nvram_write_byte(~sum, ATARI_CKS_LOC); | |
801 | __nvram_write_byte(sum, ATARI_CKS_LOC + 1); | |
802 | } | |
803 | ||
804 | #ifdef CONFIG_PROC_FS | |
805 | ||
806 | static struct { | |
807 | unsigned char val; | |
808 | char *name; | |
809 | } boot_prefs[] = { | |
810 | { 0x80, "TOS" }, | |
811 | { 0x40, "ASV" }, | |
812 | { 0x20, "NetBSD (?)" }, | |
813 | { 0x10, "Linux" }, | |
814 | { 0x00, "unspecified" } | |
815 | }; | |
816 | ||
817 | static char *languages[] = { | |
818 | "English (US)", | |
819 | "German", | |
820 | "French", | |
821 | "English (UK)", | |
822 | "Spanish", | |
823 | "Italian", | |
824 | "6 (undefined)", | |
825 | "Swiss (French)", | |
826 | "Swiss (German)" | |
827 | }; | |
828 | ||
829 | static char *dateformat[] = { | |
830 | "MM%cDD%cYY", | |
831 | "DD%cMM%cYY", | |
832 | "YY%cMM%cDD", | |
833 | "YY%cDD%cMM", | |
834 | "4 (undefined)", | |
835 | "5 (undefined)", | |
836 | "6 (undefined)", | |
837 | "7 (undefined)" | |
838 | }; | |
839 | ||
840 | static char *colors[] = { | |
841 | "2", "4", "16", "256", "65536", "??", "??", "??" | |
842 | }; | |
843 | ||
844 | #define fieldsize(a) (sizeof(a)/sizeof(*a)) | |
845 | ||
846 | static int | |
847 | atari_proc_infos(unsigned char *nvram, char *buffer, int *len, | |
848 | off_t *begin, off_t offset, int size) | |
849 | { | |
850 | int checksum = nvram_check_checksum(); | |
851 | int i; | |
852 | unsigned vmode; | |
853 | ||
854 | PRINT_PROC("Checksum status : %svalid\n", checksum ? "" : "not "); | |
855 | ||
856 | PRINT_PROC("Boot preference : "); | |
857 | for (i = fieldsize(boot_prefs) - 1; i >= 0; --i) { | |
858 | if (nvram[1] == boot_prefs[i].val) { | |
859 | PRINT_PROC("%s\n", boot_prefs[i].name); | |
860 | break; | |
861 | } | |
862 | } | |
863 | if (i < 0) | |
864 | PRINT_PROC("0x%02x (undefined)\n", nvram[1]); | |
865 | ||
866 | PRINT_PROC("SCSI arbitration : %s\n", | |
867 | (nvram[16] & 0x80) ? "on" : "off"); | |
868 | PRINT_PROC("SCSI host ID : "); | |
869 | if (nvram[16] & 0x80) | |
870 | PRINT_PROC("%d\n", nvram[16] & 7); | |
871 | else | |
872 | PRINT_PROC("n/a\n"); | |
873 | ||
874 | /* the following entries are defined only for the Falcon */ | |
875 | if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON) | |
876 | return 1; | |
877 | ||
878 | PRINT_PROC("OS language : "); | |
879 | if (nvram[6] < fieldsize(languages)) | |
880 | PRINT_PROC("%s\n", languages[nvram[6]]); | |
881 | else | |
882 | PRINT_PROC("%u (undefined)\n", nvram[6]); | |
883 | PRINT_PROC("Keyboard language: "); | |
884 | if (nvram[7] < fieldsize(languages)) | |
885 | PRINT_PROC("%s\n", languages[nvram[7]]); | |
886 | else | |
887 | PRINT_PROC("%u (undefined)\n", nvram[7]); | |
888 | PRINT_PROC("Date format : "); | |
889 | PRINT_PROC(dateformat[nvram[8] & 7], | |
890 | nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/'); | |
891 | PRINT_PROC(", %dh clock\n", nvram[8] & 16 ? 24 : 12); | |
892 | PRINT_PROC("Boot delay : "); | |
893 | if (nvram[10] == 0) | |
894 | PRINT_PROC("default"); | |
895 | else | |
896 | PRINT_PROC("%ds%s\n", nvram[10], | |
897 | nvram[10] < 8 ? ", no memory test" : ""); | |
898 | ||
899 | vmode = (nvram[14] << 8) || nvram[15]; | |
900 | PRINT_PROC("Video mode : %s colors, %d columns, %s %s monitor\n", | |
901 | colors[vmode & 7], | |
902 | vmode & 8 ? 80 : 40, | |
903 | vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC"); | |
904 | PRINT_PROC(" %soverscan, compat. mode %s%s\n", | |
905 | vmode & 64 ? "" : "no ", | |
906 | vmode & 128 ? "on" : "off", | |
907 | vmode & 256 ? | |
908 | (vmode & 16 ? ", line doubling" : ", half screen") : ""); | |
909 | ||
910 | return 1; | |
911 | } | |
912 | #endif | |
913 | ||
914 | #endif /* MACH == ATARI */ | |
915 | ||
916 | MODULE_LICENSE("GPL"); | |
917 | ||
918 | EXPORT_SYMBOL(__nvram_read_byte); | |
919 | EXPORT_SYMBOL(nvram_read_byte); | |
920 | EXPORT_SYMBOL(__nvram_write_byte); | |
921 | EXPORT_SYMBOL(nvram_write_byte); | |
922 | EXPORT_SYMBOL(__nvram_check_checksum); | |
923 | EXPORT_SYMBOL(nvram_check_checksum); | |
924 | EXPORT_SYMBOL(__nvram_set_checksum); | |
925 | EXPORT_SYMBOL(nvram_set_checksum); | |
926 | MODULE_ALIAS_MISCDEV(NVRAM_MINOR); |